1021294551420 has 288 divisors, whose sum is σ = 3693849868800. Its totient is φ = 225129991680.

The previous prime is 1021294551331. The next prime is 1021294551421. The reversal of 1021294551420 is 241554921201.

1021294551420 is a `hidden beast` number, since 1 + 0 + 2 + 12 + 94 + 551 + 4 + 2 + 0 = 666.

It is a super-5 number, since 5×1021294551420⁵ (a number of 61 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021294551421) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1428481 + ... + 2020679.

It is an arithmetic number, because the mean of its divisors is an integer number (12825867600).

Almost surely, 2^{1021294551420} is an apocalyptic number.

1021294551420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021294551420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1846924934400).

1021294551420 is an abundant number, since it is smaller than the sum of its proper divisors (2672555317380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021294551420 is a wasteful number, since it uses less digits than its factorization.

1021294551420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592305 (or 592300 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The spelling of 1021294551420 in words is "one trillion, twenty-one billion, two hundred ninety-four million, five hundred fifty-one thousand, four hundred twenty".